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Subject[PATCH 1/6] IB/ehca: Serialize hypervisor calls in ehca_register_mr()
Date
From: Stefan Roscher <stefan.roscher@de.ibm.com>

Some pSeries hypervisor versions show a race condition in the allocate MR hCall.
Serialize this call per adapter to circumvent this problem.

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
---
drivers/infiniband/hw/ehca/ehca_classes.h | 1 +
drivers/infiniband/hw/ehca/ehca_main.c | 2 ++
drivers/infiniband/hw/ehca/hcp_if.c | 14 ++++++++++++--
3 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/ehca/ehca_classes.h b/drivers/infiniband/hw/ehca/ehca_classes.h
index 10fb8fb..4bc5cb3 100644
--- a/drivers/infiniband/hw/ehca/ehca_classes.h
+++ b/drivers/infiniband/hw/ehca/ehca_classes.h
@@ -276,6 +276,7 @@ void ehca_cleanup_mrmw_cache(void);

extern spinlock_t ehca_qp_idr_lock;
extern spinlock_t ehca_cq_idr_lock;
+extern spinlock_t hcall_lock;
extern struct idr ehca_qp_idr;
extern struct idr ehca_cq_idr;

diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index 2d37054..2e27e68 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -98,6 +98,7 @@ MODULE_PARM_DESC(scaling_code,

spinlock_t ehca_qp_idr_lock;
spinlock_t ehca_cq_idr_lock;
+spinlock_t hcall_lock;
DEFINE_IDR(ehca_qp_idr);
DEFINE_IDR(ehca_cq_idr);

@@ -817,6 +818,7 @@ int __init ehca_module_init(void)
idr_init(&ehca_cq_idr);
spin_lock_init(&ehca_qp_idr_lock);
spin_lock_init(&ehca_cq_idr_lock);
+ spin_lock_init(&hcall_lock);

INIT_LIST_HEAD(&shca_list);
spin_lock_init(&shca_list_lock);
diff --git a/drivers/infiniband/hw/ehca/hcp_if.c b/drivers/infiniband/hw/ehca/hcp_if.c
index b564fcd..bb76134 100644
--- a/drivers/infiniband/hw/ehca/hcp_if.c
+++ b/drivers/infiniband/hw/ehca/hcp_if.c
@@ -154,7 +154,9 @@ static long ehca_plpar_hcall9(unsigned l
unsigned long arg9)
{
long ret;
- int i, sleep_msecs;
+ int i, sleep_msecs, lock_is_set = 0;
+ unsigned long flags;
+

ehca_gen_dbg("opcode=%lx arg1=%lx arg2=%lx arg3=%lx arg4=%lx "
"arg5=%lx arg6=%lx arg7=%lx arg8=%lx arg9=%lx",
@@ -162,10 +164,18 @@ static long ehca_plpar_hcall9(unsigned l
arg8, arg9);

for (i = 0; i < 5; i++) {
+ if ((opcode == H_ALLOC_RESOURCE) && (arg2 == 5)) {
+ spin_lock_irqsave(&hcall_lock, flags);
+ lock_is_set = 1;
+ }
+
ret = plpar_hcall9(opcode, outs,
arg1, arg2, arg3, arg4, arg5,
arg6, arg7, arg8, arg9);

+ if (lock_is_set)
+ spin_unlock_irqrestore(&hcall_lock, flags);
+
if (H_IS_LONG_BUSY(ret)) {
sleep_msecs = get_longbusy_msecs(ret);
msleep_interruptible(sleep_msecs);
@@ -193,11 +203,11 @@ static long ehca_plpar_hcall9(unsigned l
opcode, ret, outs[0], outs[1], outs[2], outs[3],
outs[4], outs[5], outs[6], outs[7], outs[8]);
return ret;
-
}

return H_BUSY;
}
+
u64 hipz_h_alloc_resource_eq(const struct ipz_adapter_handle adapter_handle,
struct ehca_pfeq *pfeq,
const u32 neq_control,
--
1.4.2.1

-
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